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AD7575TQ Fiches technique(PDF) 1 Page - Analog Devices |
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AD7575TQ Fiches technique(HTML) 1 Page - Analog Devices |
1 / 12 page REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a LC2MOS 5 s 8-Bit ADC with Track/Hold AD7575 FUNCTIONAL BLOCK DIAGRAM TRACK AND HOLD CLOCK OSCILLATOR DAC SAR COMP CONTROL LOGIC LATCH AND THREE STATE OUTPUT DRIVERS AD7575 VDD AIN AGND VREF CLK CS RD TP BUSY DGND DB7 DB0 GENERAL DESCRIPTION The AD7575 is a high speed 8-bit ADC with a built-in track/ hold function. The successive approximation conversion tech- nique is used to achieve a fast conversion time of 5 µs, while the built-in track/hold allows full-scale signals up to 50 kHz (386 mV/ µs slew rate) to be digitized. The AD7575 requires only a single +5 V supply and a low cost, 1.23 V bandgap reference in order to convert an input signal range of 0 to 2 VREF. The AD7575 is designed for easy interfacing to all popular 8-bit microprocessors using standard microprocessor control signals ( CS and RD) to control starting of the conversion and reading of the data. The interface logic allows the AD7575 to be easily configured as a memory mapped device, and the part can be interfaced as SLOW-MEMORY or ROM. All data outputs of the AD7575 are latched and three-state buffered to allow direct connection to a microprocessor data bus or I/O port. The AD7575 is fabricated in an advanced, all ion-implanted high speed Linear Compatible CMOS (LC 2MOS) process and is available in a small, 0.3" wide, 18-lead DIP, 18-lead SOIC or in other 20-terminal surface mount packages. FEATURES Fast Conversion Time: 5 s On-Chip Track/Hold Low Total Unadjusted Error: 1 LSB Full Power Signal Bandwidth: 50 kHz Single +5 V Supply 100 ns Data Access Time Low Power (15 mW typ) Low Cost Standard 18-Lead DlPs or 20-Terminal Surface Mount Packages PRODUCT HIGHLIGHTS 1. Fast Conversion Time/Low Power The fast, 5 µs, conversion time of the AD7575 makes it suitable for digitizing wideband signals at audio and ultra- sonic frequencies while retaining the advantage of low CMOS power consumption. 2. On-Chip Track/Hold The on-chip track/hold function is completely self-contained and requires no external hold capacitor. Signals with slew rates up to 386 mV/ µs (e.g., 2.46 V peak-to-peak 50 kHz sine waves) can be digitized with full accuracy. 3. Low Total Unadjusted Error The zero, full-scale and linearity errors of the AD7575 are so low that the total unadjusted error at any point on the trans- fer function is less than 1 LSB, and offset and gain adjust- ments are not required. 4. Single Supply Operation Operation from a single +5 V supply with a low cost +1.23 V bandgap reference allows the AD7575 to be used in 5 V microprocessor systems without any additional power supplies. 5. Fast Digital Interface Fast interface timing allows the AD7575 to interface easily to the fast versions of most popular microprocessors such as the Z80H, 8085A-2, 6502B, 68B09 and the DSP processor, the TMS32010. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 |
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